A machine gun fires $10$ bullets/s, each of mass $10 g$ , the speed of each bullet is $20 c m / s$ , then force of recoil is

200 dyne

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2000 dyne

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20 dyne

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None

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Solution

The correct option is B 2000 dyne
The machine gun fires at $10$ bullets/sec
The mass of each bullet is $10$ grams
The speed of each bullet is $20$ cm/sec
The force of recoil $=$ Rate of change of linear momentum $= 10 \times 10 \times 20 = 2000 d y n e$
Therefore the correct option is $B$

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